I haven't flipped mine yet, Thank God!

I put a little thought into it lately as we have been fishing the 'Duc. I also was trying to meet the Coast Guard regs for Navigable waters as I get out on the Sound and The Columbia etc, (with the kicker).
I ALWAYS wear my lifejacket. I have found one that is quite comfortable, warm and dry. Everyone on board has to at least have one with them.
I have a whistle with me.
Cell phone is charged up.
I had an air horn, but it didn't last two weeks.

and just for luck ...
I have put "THIS SIDE UP" stickers on. I have also painted "CALL 911" on the bottom of the boat.